some fix

include/pocketpy/codeobject.h

@@ -71,9 +71,9 @@ struct CodeObject {
     std::vector<int> iblocks;       // block index for each bytecode
     std::vector<LineInfo> lines;
     
-    small_vector_no_copy_and_move<PyObject*, 8> consts;
+    small_vector_no_copy_and_move<PyObject*, 8> consts;         // constants
+    small_vector_no_copy_and_move<StrName, 8> varnames;         // local variables
 
-    pod_vector<StrName> varnames;      // local variables
     NameDictInt varnames_inv;
     std::vector<CodeBlock> blocks;
     NameDictInt labels;